6
2.4 XL Series Benefits
With Celeros
EzSAN
XL Series, you can:
♦
Add storage to your existing environment quickly, easily, and most important,
cost-efficient.
♦
Consolidated storage and back ups for multiple servers.
♦
Improved data availability and efficiency.
♦
Reduced costs by the centralization of storage management.
♦
Simplify the on-going installation and management of storage.
2.5 XL Series feature summary
♦
Hardware based RAID levels 0,1,3,5,6,10,50,60
♦
Online volume expansion
♦
UPS support
♦
Network Fault Tolerance
♦
Adaptive load balancing
♦
Multiple scheduled snapshots
♦
Synchronous mirroring
♦
Replication
♦
Support for a wide variety of hardware and s/w initiators
♦
Celeros XL series can improve existing setup performance by centralizing storage
for a shared use of resources and processing power “effectively”.
2.6 RAID types
This manual is not intended to replace your RAID controller manual. But we want to provide
you with an overview of common RAID types so that you can make an informed decision on
which type to choose. Depending on whom you ask, RAID means either Redundant Array of
Independent Disks or Redundant Array of Inexpensive Disks. Both are correct. In essence,
you combine the capacity, speed and security of several disks into one.
RAID 0
forms one large hard disk by concatenating stripes from each member drive. Stripe
size is configurable roughly between 64 KB and 1 MB. The result is a lightning-fast RAID,
but with no added security. One failing drive may ruin the entire RAID.
RAID 1
mirrors hard drives. By writing identical data onto more than one drive, security is
enhanced. A completely defective drive does not cause any loss of data. The drawback is
reduced performance and capacity.
RAID 5
combines data striping from RAID 0 with parity checking, therefore combining speed
and improved security. The loss of one drive is tolerable.
RAID 6
extends RAID 5 by adding an additional parity block, thus it uses block-level striping
with two parity blocks distributed across all member disks. It was not one of the original
RAID levels. The user capacity of a RAID 6 array is N-2, where N is the total number of
drives in the array. RAID 6 does not have a performance penalty for read operations, but it
does have a performance penalty on write operations due to the overhead associated with the
additional parity calculations.
RAID 10
is a combination of RAID 1 and 0, hence the name. Data is written in a striped and
mirrored configuration, providing high performance and robust security.
